Shorten task status phrase

## What does this MR do?
Shortens the task status phrase to make it easier to read

## Are there points in the code the reviewer needs to double check?
Shouldn't be any

## Why was this MR needed?
Improve readability/scan-ability of the issues table

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-08-27_at_12.38.17_PM](/uploads/12d54e4ce24dea203e8f7189b32e3a43/Screen_Shot_2016-08-27_at_12.38.17_PM.png)

After:
![Screen_Shot_2016-08-27_at_12.38.05_PM](/uploads/7dfcc3284025b889f6afa09ca273d928/Screen_Shot_2016-08-27_at_12.38.05_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #21543

See merge request !6062